diff --git a/gb.gtk/src/gmainwindow.cpp b/gb.gtk/src/gmainwindow.cpp
index 3dd215009..bc3298880 100644
--- a/gb.gtk/src/gmainwindow.cpp
+++ b/gb.gtk/src/gmainwindow.cpp
@@ -232,6 +232,7 @@ void gMainWindow::initialize()
 	_resize_last_w = _resize_last_h = -1;
 	_min_w = _min_h = 0;
 	_transparent = false;
+	_utility = false;
 
 	onOpen = NULL;
 	onShow = NULL;